i'm afraid that she has some trouble ( ) the math problems.

初三英语选择题 I'm afraid that she has some trouble ( ) the math problems.
如题 A.working out B.to work out C.works out D.working hard
选择前若能把每个选项的思考过程一同写上当然最好了.
我一直徘徊在 一个句子只能有一个动词,哪里需要to还是不需要to..
答：A
译：我担心她解决这些数学难题有些吃力.
析：sb.has some trouble/ difficulty (in) doing sth.表示“某人在做某事方面有困难”,介词in可以省略.
确切地说,应该是：一个简单句中只能有一个谓语（动词）.v-ing,to do sth.及过去分词p.p 是非谓语动词形式.
I'm afraid that she has some trouble working out the math problems.
这是一个复合句,主句是I am afraid+that-从句.其谓语动词是am,
从句中的谓语动词是have,some trouble是其宾语,working out .是分词短语表示作状语,表示“在做某事时”.